(Topic ID: 210872)

System 11 Lamp Matrix

By PinWiz1969

1 year ago

Topic Stats

  • 4 posts
  • 3 Pinsiders participating
  • Latest reply 1 year ago by PinWiz1969
  • No one calls this topic a favorite


Linked Games

  • Taxi Williams, 1988
#1 1 year ago

Hey guys,

Thanks in advance for any replies on helping me diagnose this strange one.

I’ve got a Taxi (system 11B) with rows 2(Q81), 3(Q82), 5(Q84), and 6(Q85) out. I’ve replaced all TIP42’s with TIP42C’s, I’ve Replaced both 7406 at U55, and U56. The reason I replaced both IC’s, 1. They’re cheap. 2. When I ground out the TIP42 rows that aren’t working they light.

I’m stumped. Any suggestions?

#2 1 year ago

Have you already replaced the connectors that the rows travel through? If not, I'd be replacing those at the CPU and at the interconnect board.

#3 1 year ago

Also, that area of the board gets super hot, and the traces can get burnt and fall apart. Inspect all relevant traces as well as you can.

#4 1 year ago

Problem solved! So the column side of the matrix uses TIP42 transistors, however, the row side needs TIP102/122. All lamps working fine now!

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